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References

Gilbert O and Bocock K L 1960 Changes in leaf-litter when place on the surface of soils with contrasting humus types. II. Changes in the nitrogen content of oak and ash leaf-litter. J. Soil Sci. 11, 10–19.Google Scholar

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INTEC (Instituto de Investigaciones Tecnológicas) 1978 A Report to the Health Ministry: A Program to Control Atmospheric Pollution in the Metropolitan Area of Santiago: INTEC. 120 p. (Mimeo, in Spanish.)Google Scholar